Merge pull request #329 from BookingSync/dependabot/bundler/kramdown-2.3.0

Bump kramdown from 1.3.2 to 2.3.0

Author: Azdaroth

Gemfile.lock

@@ -68,7 +68,8 @@ GEM
     i18n (0.9.1)
       concurrent-ruby (~> 1.0)
     json (2.3.0)
-    kramdown (1.3.2)
+    kramdown (2.3.0)
+      rexml
     listen (2.7.0)
       celluloid (>= 0.15.2)
       celluloid-io (>= 0.15.0)
@@ -103,6 +104,7 @@ GEM
     rb-inotify (0.9.3)
       ffi (>= 0.5.0)
     retriable (2.1.0)
+    rexml (3.2.4)
     sass (3.4.25)
     sassc (2.2.1)
       ffi (~> 1.9)